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System and method for video processing

a video processing and video signal technology, applied in the field of video signal processing, can solve the problems of high cost and time consumption, and achieve the effect of simplifying the downstream time compression process

Inactive Publication Date: 2010-05-04
GRASS VALLEY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides methods for changing the length of a video program by processing a compressed video signal. The methods involve selecting frames, combining frames, and inserting frames to achieve the desired change in length. The frames can be B-frames, which are not used in prediction coding, and can be smaller in number than the frames in other categories. The B-frames can be combined by selecting two adjacent ones or by interpolating between them. The timing of the bitstream can be adjusted to ensure the output is at the standard frame rate. The invention also provides a method for video compression coding, identifying groups of frames as B-frames and coding them separately. The B-frames can be flagged to simplify the combination process. The coding method prioritizes frames that are less likely to result in the loss of lipsynch when processed. The downstream time compression process can select the least perceptible B-frames for deletion and then progressively more perceptible ones. The coding method also replaces each pair of B-frames with a combination of them to simplify the downstream process.

Problems solved by technology

The alternative exists of reediting the material but this is likely to be expensive and time-consuming.

Method used

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Embodiment Construction

[0033]This invention will be described by taking the well-known MPEG compression standards as an example. A well understood feature of MPEG is the GOP structure in which frames of different prediction categories are grouped together. I-frames are intra-coded. P-frames are prediction coded. In long GOP structures there are typically also large numbers of B-frames that are prediction coded using both forward and backward pointing motion vectors. B-frames are not employed in the prediction coding of other frames.

[0034]Each frame is divided into macroblocks and motion vectors associated with macroblocks in are employed to motion compensate the prediction. For each macroblock, separate choices can be made in the coding mode for that macroblock.

[0035]The order in which the various frames of the GOP are transmitted in the GOP structure is of course different from the intended order of presentation. Different frames may contain different amounts of information. In the MPEG scheme, so-called...

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Abstract

A video program length is changed by processing an MPEG compressed video signal. Two temporally adjacent B-frames are selected, by looking for pairs with small differences. The selected B-frames are combined to create at least one intermediate frame; which is inserted in place of or between the selected frames. Presentation time stamps are altered to provide a uniform display rate.

Description

RELATED APPLICATION DATA[0001]The present application claims benefit from prior UK application No. 0407591.7, filed Apr. 2, 2004, incorporated by reference herein in its entirety.BACKGROUND OF THE INVENTION[0002]This invention relates to the field of video signal processing, and in particular to time compression or time expansion.[0003]It is often desirable in the television industry for the content received by a broadcaster to be shortened in time, either to reduce the video program length to fit a desired time slot, or to provide additional broadcast time into which revenue-generating commercials can be inserted. Typically, a video program will be reduced in length by up to four percent.[0004]One commercially available product operates by identifying candidate fields in the uncompressed video sequence and deleting them. A candidate field might be one in which there is close similarity with the neighbouring fields.[0005]Automated deletion of fields is cost effective but can introdu...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04B1/66H04N7/26H04N7/46H04N7/50
CPCG11B27/031H04N19/105H04N19/139H04N19/577H04N19/61H04N19/132H04N19/31H04N19/587H04N19/172H04N21/234381H04N19/40
Inventor BROOKS, DAVIDKNEE, MICHAEL JAMESDIGGINS, JONATHAN
Owner GRASS VALLEY LTD
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